but katie bar the door, things could get messy. which is why i think folks ratcheted down. >> what is that katie door? >> it is an old time saying. >> a wild ride continuing today. china central bank issuing a warning. but in the united states, bank of america became the first big wall street firm to cover bitcoin. last week we asked traders which would they rather investment? take a listen to what brian kelly had to say. >> easy for me. bitcoin. >> what? >> are you serious? >> i am dead serious. >> no. >> yes. >> that's your turkey trade for neck ye next year. >> it is a speculative trade. this is tulip mania and i think it goes higher. >> we will hold that clip. >> we did hold that clip. does b.k. still think that b bitcoin is a buy? now what? >> i do this it's a buy if you can buy it. it's not as easy. i signed in, was ready to buy it. i wanted to buy it below $1,000 so when i saw it get down to $870, that's what piqued my interest. you put your bid in and you say you need to fund your account but to fund your account you need t